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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0515ce8b7c25c62f37275c35edf9ba786c116c05abb0e46c02d422542bdcc86' 
  AND token = 'WU+Le3YaKVmXgwRd8hoQT4a5KJu4taV1ua1MWbWeTYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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