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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f66275e6a94b9fcb2b3419cb3893fe52f1d30c68713576e0701d3d4812046df6' 
  AND token = 'zqTKdl7BKeN8AQki2dsQ84B5RblpJrJlHPPlXYy+Ae0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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