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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c71f5dfa42a0d29db452a71d7fa4fe3658563013a6b2bec8bfe03860e583d15' 
  AND token = 'PTRPJFR0r0PdFe0uoLhpkrK6OngofW7vD1YSdQDuV3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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