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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b95c61ea4e8354afdeb6e3aba84eba3d233e53964d0230688d17ed2260af095f' 
  AND token = '6T5FFolQdyzj8l5Ly8PpL7oQAm4x1JNOCy4GaOI29Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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