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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a817589fcef73c5ecfd99345cc0bdb8e3962c18dc4ead4bff8d32825aa9cb563' 
  AND token = 'pNgo5yJoq/8I1LSPnNOoYw9xvM+glgM0/g4GiuSISYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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