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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e848dff1b3f42a1a86665f3d43c290d335e62ca356a62c4039a3215ca825891a' 
  AND token = 'TrVrJytaKD8H/fOItfZ0NPmlUoVWxzI+25XzDGlSgWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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