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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3089590e8c9e1f92ec0109bcf902b5e40d6cb038c31d628b03aaec7dd39cc81' 
  AND token = 'D5BxPXhLMrCu4PGrufitMzyQapn+Sj9mMta9R4kjM+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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