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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '427d5d44614bf19e21c7cb7fd0b198915be2c9304aaad40f144f2fc9173c1229' 
  AND token = '5nL7nT0qm11Fhic1lV/oFOV1lesyAqmIRmqowD0l0kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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