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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccac55e0f5d6171437fa00a80cc5d77187cd39bdba7bc8019a40651ebdc4b4c5' 
  AND token = 'Sug9NfriV2nw/4K5znPKilK39dQqAviYMlauXGRYjls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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