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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1763a3eb4a52bea20e1ce4b64c66bfe25c88dbde65fb745d9ebbea68d10c4f1' 
  AND token = 'VP1SFhLDVb07WomwNweDx6lFUQveqNRJ/qh3kqGg+cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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