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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e80d21668a6ae23083329cbdfaf8d17fe26e58802d1a9fc1574cd1b8ccec886' 
  AND token = '8xbPOFsRlqz71h0vs4Kwy9U19VTL8z3s/Wlp1w65bJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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