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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b695bb15c2de6daf6478c41cd58bb1da1a7c4404bb92fc1423988f2ede14b9aa' 
  AND token = '0cmiMMCTsXRjJEOF5FR0++MxUYCn6/aXd3ZrCebVRH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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