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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7d42282ed2a6f84ba2b8c6b944923079336995d41dd6a78a42da9ba9901cb45' 
  AND token = 'Tq9/417GRfWM4WVh4f6tbgDb11r1IgLTSVaGyX+26Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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