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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14b3ee0c97d629d48aace50aaa3659cf4c40bf4a6247eb4827e42b84b1a89b3a' 
  AND token = '5pf9RTvTfBLrftLShlgShF5unxYF/e76ghduweovyCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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