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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99150b3fa60b213b1faf9e3adc9754d4ba060db23fde3c17ffa6a69ea17b6fa4' 
  AND token = 'fdQxVkXtdFeVp0sDjojbdxCfXfJY61+qdAaM4iHCRrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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