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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaadcda1f5dda8743a231e4a89ffa664a82522a91a93598a0e720b6b620dc2b8' 
  AND token = '+NaHv5vCWMQjQkk8nmNhLERH9fACEyqUEfvXJSSoJ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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