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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05d628fb3c522f6c57b9c9e4d693436e8772e5ad17def2e82eaa331f84eb5d8c' 
  AND token = 'Ri/23fwVoXIxOFQ2ufyzoUacNpsXkQ3Vn+ry1fAZ77Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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