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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbeac1248d98cf20f15153d257fed0b5fd68d8c201e856543980952656820674' 
  AND token = 'bvbItkWjoV/S2BaO8oKvWecFe8tc37/uyH7nNAKClsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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