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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d1e352f4fdedbf0a92ec06f16d1f2848cf948ba7c08029b2958c26b9e82ca56' 
  AND token = 'JhPF6pIVAUEOcb9jSOWlmgOwM+4cfS7EWAQq2ENVY1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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