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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f423d8938f6306e231f9acd36b3f76c43d2bb28cfcf74769363f1388158e67e' 
  AND token = 'FrdxXh/7CB5a2yseMBjBS/73mJiQuor0Mb/XZAmBn5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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