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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0464359235fdda89095bcc4fbf02b5823961af868c137cab9da9d6a2b9474c66' 
  AND token = 'lMu0rR4768fz2tHX9fOVZkirLPpE/nzIWA5amWJ9WBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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