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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00368ff1cf6074adb1f87d18c93bcb3b820d861aa2462b0f18b1f78f1b979f5d' 
  AND token = 'WQFXkNPMGlAxwcSuaaFl5Ds+VN2+i0anrTvB1mosyNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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