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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9dcdfcd906bb288dc6460e439c488d8dc4f26224b4beb0191a3d9c226f68c71' 
  AND token = 'fVIISkxq+kSXFC0SHwGQUyBRIv+v63tTh6CR806DpdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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