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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eee6dfce2fad674a15894cf3ad93b309e4723fb026108e36e12c04ba9a369520' 
  AND token = 'wTtUT+v3/5Cs85XIli5vhNhmi5TxFG3/kn4IEcY0aA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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