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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8408e1302ed75f827121362ee3c3f0e6762f690502c19bb12f4a6cff13e8ff7' 
  AND token = 'omVv8tBXaobKFqWdA0osXh2dc/h4mmZX1pl1uM4vsCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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