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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bdbdcf73eb8b5eaf2cd8f69c496adc979a244d5357437bc28c46fe223814bf8' 
  AND token = 'Yar+g8xZZUlOrIdepNXeBpKOJ/MHX02PMKaz4EAp7R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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