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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '978b34f0123ea5220fc4baef63a700412d1bd38eaeb28693bd6bcb149c9128f9' 
  AND token = 'Qy+6TJutF3Lz0dkZbLrRbJFgkUeUBCci437Tj3Ojl1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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