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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b123d27b3e85b1f268e1fbfaa04351c5ed1cacb936bd6b1a9defac66072637f' 
  AND token = 'dYSYVsGVjhmhf/MTecfscol86FVwxRK6KpO6is5tp7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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