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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4b76759d91fd94792556fcdec7ce3a501f4771a3b8fdcf34de31983da35c698' 
  AND token = '6tMtip7kbPqH8p5/3AVox0hQnom7qzEsTK/H2KUezSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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