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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b8dbee841a1be6064f5f318d0df00dedda7287012cae77961492095f7cbd036' 
  AND token = '4fcGCrxf/kI6Upz6Z6MGKV1fAVXIGge1CoI3a5IoFrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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