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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '547a13b6af8704aee3d58a248de0ce8c3ac1659072494d050898c3f2dfd6bf55' 
  AND token = 'G+2w52pcxmKbQTFX79RVLLo/7B37WkswT7he7+DGmas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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