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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abce2d2cdc4562b155b7ba5cf5f91e1ecabf215b6c2aa28a36c27a3bdd1d684c' 
  AND token = '77WEA3JtvV3C0070lc4C7QmRno9N7O4yVkqVhld3Xn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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