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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26b724804ef9aa9d05d04d4e8fa3a8edef49ddb42a3e871f865cbac9f208ed37' 
  AND token = 'rBu4qVJqaFPpYIgKKMbW02/EY7sBsWU1XKKL32uLFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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