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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '439e49e95933a1ff1017cbe03a823d8b048617591c8b04ec24b227545468788d' 
  AND token = '5SEeld6PYe1HG1TEH2tUJkqCZ5gZJ3S0g8Hw25pAC1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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