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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52e3a3b8661efbced8d0dd8d3a2985e7976054dead341dac0f1fa6741cdeca13' 
  AND token = 'v3jI92t4W766rRxwxOX2Ih43SeTcN2xa3iAuuucRZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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