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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0c3f9a1916e8a76685a540228a39cf9bf4d765c0bccb7a29969cd59b0dd7d19' 
  AND token = 'Oo96WqwpNJ3vxOGuqxKTyYiRfTASzlfJXrteExz5OuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}