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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dec973f0d670093f63a555348a279501afd59ab720f0c2e7cb720edb1068ce2' 
  AND token = 'Pl0dID+kN0eledZVUp89Oo5Y+7dIOoLA6OvOb6kE1GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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