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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a67a3dc99f219599437c1dce66fce5482fd9e7cb84f076bb43bdf1eac1b9640' 
  AND token = 'y1kDSwIQ6ITjmDkaXm3q1j6w/TVWYviM2Z6fZXsAmx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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