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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97f9a3f558ccc9e56da97822f092055bf7708d37ecb4ef4b4b6666917206f74f' 
  AND token = 'PROlnjc6MeHgV7Ff3RZdt1Tiaevbv37W29uctfZz1D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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