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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d03dcc77977d8d56eb57c0322172c804e67ee5794615f09b0c622257211a799' 
  AND token = '01Axm8/sXZyx5WtHASwSGhco2VJwcf2YlSv0sgAVt4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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