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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0635510058e58a7357c3ffd7f6e7b393e558809dd66ddb058a5cf9df7d9b599' 
  AND token = '7eANZBNoq3eHUtKZ3HUjB2INPbeFIQ8ULmekTt3+VYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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