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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '800eec6802f0a393423a6c97ff8fed51d95662a5ce33f1b11f8a9cfa229ce208' 
  AND token = 'hES+r8egNGPmt8+Q9dPBjx0b6Y8uJniVrRAiaJg/GuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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