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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aedf65eba461d0eaccb34a3c7b31e7659913943c2f50238e443d3e3b4d5c5d4a' 
  AND token = 'pPJ59JQdHPzJhanQ4c+ZX0Inp3jjUEb14BL+pemga7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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