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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34cfd920ae63ceec8e4e0c1f85e6a7891ced7aa45e6ef66514ad565d47da4030' 
  AND token = '19+89WPgW3nvXj8XTlOfzJLYWlM4W6cIdvb6dJddd54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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