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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b47cdeaeb5b26fc7ab84ad363d6f97b681203cd625a9476027a7f7e7ef6e80bf' 
  AND token = 'qt30CcgH0M1VT2RQeJqZH3F2Fy0/ubFi5Ak2KrIuJ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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