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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0638b0c89cc6280d67b6500d61ba4e116aecc0ec743577367af19bae162ba6ca' 
  AND token = 'yUh7HpH0AOKRY0O3bTMRejfD520mJKa9DTZytyettlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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